Boring-mill



(No Model.) I 3 Sheets-Sheet 1 J. J. KNOWLTON.

BORING MILL.

No. 430,298, Patented June 17, 1890.

(No Model.) 3 Sheets-Sheet 2.

" J. J. KNO'W LTON.

BORING MILL.

Patented June 17 UNITED STATES PATENT OFFICE.

JOHN' J. KNOIVLTON, OF SACOARAPPA, MAINE.

BORING-MILL.

SPECIFICATION forming part of Letters Patent No. 430,293, dated June 17, 1890.

Application filed March 3, 1890.

To all whom it may concern.-

Be it known that I, JOHN J. KNOWLTON, a citizen of the United States, residing at Saccarappa, in the county of Cumberland and State of Maine, have invented certain new and useful Improvementsin Boring-Mills, of which the following is a description.

My invention relates to boring-mills of that class of machines intended to be used for the finishing of pulleys, gears, and other parts of machinery which require to be bored and otherwise finished. These machines or boringmills as they have hitherto been constructed have consisted of a rotating bed or face-plate, a vertically-movable central spindle or toolholder for boring or finishing the center, and a vertical cross-head gearing and tool-stock for finishing a rim or periphery of the pulley.

The object of my invention is to combine with the features already pointed out means for finishing the faces of gears, pulleys, and

other circular and rounded articles, and to adapt them for a large class of work for which they have not hitherto been adapted.

The invention consists, chiefly, of aboringmill having a horizontal cross-head, one end of which is attached to the boring bar or spintile and the other end to a tool-stock of the vertical cross-head. By means of these horizontal cross-heads, in combination with the other parts of the boring-mill, I am able to finish accurately and quickly the largest gears, pulleys, &c.

In the accompanying drawings I have illustrated my invention as attached to a boringmill of well-known construction, and I will proceed to describe that portion of the machine which is necessary to understand the operation of my invention.

In the drawings, Figure 1 is a front elevation of a boring-mill as originally used without my attachment in place. Fig. 2 is the same elevation with my attachment in place. Fig. 3 is a side elevation of the same. Fig. 4 is a detail of clamp.

A is the frame-work of the machine,which is constructed in a substantial manner, and as here shown is designed for heavy work.

B is the face-plate or rotating bed. On the periphery of the face-plate B are'gear-teeth b, and the face-plate is rotated by means of the pinion B ,which engages the gear-teeth 1).

Serial No. 342,492. (No model.)

The pinion B is driven by means of a number of gears and pulleys, which it is not nee essary particularly to describe.

0 represents the spindle, to the upper end of which the face-plate B is attached. Spindle O is journaled in suitable bearings D.

E is the boring-bar, which is moved vertically by means of a rotating screw 6 6 represents the boring-tool in place inthe boring-bar. A perpendicular cross-head F is retained intwo horizontal guides g g, inwhich it is adapted to .move. Cross-head F is provided with a tool-stock G, which is moved vertically by the feeding-screw f, which is operated by a pair of beveled gears f.

9 represents the tool fixed in the toolstock G.

When my attachment is to be applied, the lower portion of the boring-bar E is removed and the upper portion islowered by means of a screw e so that its lower end comes to the desired height. The cross-head F is then moved to the right to its extreme position,the tool 9 removed from the tool-stock, and the cross-head J is fastened in a horizontal or inclined position above the face-plate B in the following manner: A clamp K is attached to the lower end of the boring-bar E. The

clamp K has a vertical portion 70, which extends down below the boring-bar E, and to this vertical portion one end of the cross-head J is pivoted. On the opposite end of the cross-head J is a disk or plate j, which is adapted to be bolted to the tool-stock G. In the plate j are grooved or circular slots 7' through which bolts j pass to secure it to the tool-stock G.

j is the tool-stock of the horizontal crosshead J. The feeding-screw 3' is connected by means of a universal joint with the shaft 7' journaled in bearings secured to the plate j. 0n the shaft 3' is a worm-gear, and on the extreme end of said shaft is a handle j by which the tool-stock is adjusted. Aworm h engages the worm-gear j, and is attached to a perpendicular shaft h, which is journaled in suitable bearings. It is rotated by a mitergear h which engages a miter-gear i at* tached to a horizontal shaft *6.

Motion is imparted to the shaft 41 and the gear 11 by means of a worm-gear '11 and the worm is. It will be seen that the cross-head J may be moved vertically up and down by means of the boring-bar E and the screw f, and it is so attached to the tool-stock G by means of the curved circular slots that it can be inclined at an angle with the faceplate B.

The operation of my device is evident from its construction. The movement of the toolstock 7' is provided for by the rotating screw 7' in the well-known manner. The work, Whether it be a pulley, a gear, or any other article having a face to be finished, is placed on the rotating bed or face-plate B and the tool-stock j is fed back and forth across it as it rotates.

By lifting the boring-bar E and inclining the cross-head J conical surfaces may be finished or turned.

I claim- 1. In a boring-mill, the combination, with the boring-bar and the vertical cross-head F,

of a cross-head, as J, one end of which is adapted to be secured to said boring-bar and the other end to the tool-stock of said vertic'al cross-head, a tool-stock adapted to slide longitudinally on said cross-head, and means for operating said tool-stocks, substantially as described.

2. In a boring-mill, the combination, with the boring-bar and the vertical cross-head F, of a cross-head .I, one end of whichis pivoted to said boring-bar, the other end being adjustably secured to the tool-stock of said vertical cross-head, a tool-stock for said crosshead J, and means for operating said toolstocks, substantially as shown.

In testimony whereof I aifix my signature in presence of two witnesses.

JOHN J. KNOWLTON.

Witnesses:

S. W. BATES, ROBERT A. DAVIS. 

